I`m a developer working on a BH integration for a client and I`m running into some issues login after refreshing my access_token.

This is something that used to work perfectly a few days ago and now I keep running into 500 errors.

Here`s my situation (this is all done in Postman but I`m also getting similar issues when trying to run those steps from C#):
1) Get Authorization Code using OAuth2 login
2) Get initial AccessToken by calling